Ball valve



FIG. 1 is a front, top and right side perspective view of a ball valve showing our new design;

FIG. 2 is a front elevational view thereof the rear being a mirror image of the front shown;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a left side elevational view thereof; and

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a ball valve, as shown and described. 